| /linux-6.14.4/tools/gpio/ |
| D | gpio-utils.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * GPIO tools - helpers library for the GPIO tools
17 #include <linux/gpio.h>
18 #include "gpio-utils.h"
20 #define CONSUMER "gpio-utils"
23 * DOC: Operation of gpio
27 * ioctl, including request and release for lines of gpio, read/write
28 * the value of gpio. If the user want to do lots of read and write of
29 * lines of gpio, user should use this type of api.
32 * following api will request gpio lines, do the operation and then
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| D | gpio-hammer.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * gpio-hammer - example swiss army knife to shake GPIO lines on a system
8 * gpio-hammer -n <device-name> -o <offset1> -o <offset2>
22 #include <linux/gpio.h>
23 #include "gpio-utils.h"
25 int hammer_device(const char *device_name, unsigned int *lines, int num_lines, in hammer_device() argument
30 char swirr[] = "-\\|/"; in hammer_device()
39 ret = gpiotools_request_line(device_name, lines, num_lines, in hammer_device()
40 &config, "gpio-hammer"); in hammer_device()
55 fprintf(stdout, "Hammer lines ["); in hammer_device()
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| D | gpio-event-mon.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * gpio-event-mon - monitor GPIO line events from userspace
8 * gpio-event-mon -n <device-name> -o <offset>
25 #include <linux/gpio.h>
26 #include "gpio-utils.h"
29 unsigned int *lines, in monitor_device() argument
42 return -ENOMEM; in monitor_device()
45 if (cfd == -1) { in monitor_device()
46 ret = -errno; in monitor_device()
51 ret = gpiotools_request_line(device_name, lines, num_lines, config, in monitor_device()
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| D | lsgpio.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * lsgpio - example on how to list the GPIO lines on a system
8 * lsgpio <-n device-name>
22 #include <linux/gpio.h>
24 #include "gpio-utils.h"
45 .name = "active-low",
49 .name = "open-drain",
53 .name = "open-source",
57 .name = "pull-up",
61 .name = "pull-down",
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| /linux-6.14.4/Documentation/driver-api/gpio/ |
| D | drivers-on-gpio.rst | 2 Subsystem drivers using GPIO
5 Note that standard kernel drivers exist for common GPIO tasks and will provide
6 the right in-kernel and userspace APIs/ABIs for the job, and that these
10 - leds-gpio: drivers/leds/leds-gpio.c will handle LEDs connected to GPIO
11 lines, giving you the LED sysfs interface
13 - ledtrig-gpio: drivers/leds/trigger/ledtrig-gpio.c will provide a LED trigger,
14 i.e. a LED will turn on/off in response to a GPIO line going high or low
15 (and that LED may in turn use the leds-gpio as per above).
17 - gpio-keys: drivers/input/keyboard/gpio_keys.c is used when your GPIO line
20 - gpio-keys-polled: drivers/input/keyboard/gpio_keys_polled.c is used when your
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| D | using-gpio.rst | 2 Using GPIO Lines in Linux
5 The Linux kernel exists to abstract and present hardware to users. GPIO lines
7 and preferred way to use GPIO lines is to let kernel hardware drivers deal
12 Documentation/driver-api/gpio/drivers-on-gpio.rst
18 help to refine it, see Documentation/process/submitting-patches.rst.
20 In Linux GPIO lines also have a userspace ABI.
22 The userspace ABI is intended for one-off deployments. Examples are prototypes,
23 factory lines, maker community projects, workshop specimen, production tools,
24 industrial automation, PLC-type use cases, door controllers, in short a piece
27 software-hardware interface to be set up. They should not have a natural fit
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| D | driver.rst | 2 GPIO Driver Interface
5 This document serves as a guide for writers of GPIO chip drivers.
7 Each GPIO controller driver needs to include the following header, which defines
8 the structures used to define a GPIO driver::
10 #include <linux/gpio/driver.h>
16 A GPIO chip handles one or more GPIO lines. To be considered a GPIO chip, the
17 lines must conform to the definition: General Purpose Input/Output. If the
18 line is not general purpose, it is not GPIO and should not be handled by a
19 GPIO chip. The use case is the indicative: certain lines in a system may be
20 called GPIO but serve a very particular purpose thus not meeting the criteria
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| /linux-6.14.4/Documentation/userspace-api/gpio/ |
| D | chardev.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 GPIO Character Device Userspace API
8 ``include/uapi/linux/gpio.h.``
18 Read Documentation/driver-api/gpio/drivers-on-gpio.rst to avoid reinventing
21 Similarly, for multi-function lines there may be other subsystems, such as
23 Documentation/driver-api/pwm.rst, Documentation/w1/index.rst etc, that
26 Basic examples using the character device API can be found in ``tools/gpio/*``.
28 The API is based around two major objects, the :ref:`gpio-v2-chip` and the
29 :ref:`gpio-v2-line-request`.
31 .. _gpio-v2-chip:
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| D | chardev_v1.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 GPIO Character Device Userspace API (v1)
20 The API is based around three major objects, the :ref:`gpio-v1-chip`, the
21 :ref:`gpio-v1-line-handle`, and the :ref:`gpio-v1-line-event`.
26 .. _gpio-v1-chip:
31 The Chip represents a single GPIO chip and is exposed to userspace using device
34 Each chip supports a number of GPIO lines,
35 :c:type:`chip.lines<gpiochip_info>`. Lines on the chip are identified by an
36 ``offset`` in the range from 0 to ``chip.lines - 1``, i.e. `[0,chip.lines)`.
38 Lines are requested from the chip using either gpio-get-linehandle-ioctl.rst
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| D | gpio-handle-set-config-ioctl.rst | 1 .. SPDX-License-Identifier: GPL-2.0
11 gpio-v2-line-set-config-ioctl.rst.
16 GPIOHANDLE_SET_CONFIG_IOCTL - Update the configuration of previously requested lines.
29 The file descriptor of the GPIO character device, as returned in the
30 :c:type:`request.fd<gpiohandle_request>` by gpio-get-linehandle-ioctl.rst.
34 requested lines.
39 Update the configuration of previously requested lines, without releasing the
42 The configuration applies to all requested lines.
44 The same :ref:`gpio-get-linehandle-config-rules` and
45 :ref:`gpio-get-linehandle-config-support` that apply when requesting the
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| D | gpio-v2-line-set-config-ioctl.rst | 1 .. SPDX-License-Identifier: GPL-2.0
12 GPIO_V2_LINE_SET_CONFIG_IOCTL - Update the configuration of previously requested lines.
25 The file descriptor of the GPIO character device, as returned in the
26 :c:type:`request.fd<gpio_v2_line_request>` by gpio-v2-get-line-ioctl.rst.
30 requested lines.
35 Update the configuration of previously requested lines, without releasing the
38 The new configuration must specify a configuration for all requested lines.
40 The same :ref:`gpio-v2-get-line-config-rules` and
41 :ref:`gpio-v2-get-line-config-support` that apply when requesting the lines
48 bi-directional lines between input and output, but it may also be used to
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| /linux-6.14.4/include/uapi/linux/ |
| D | gpio.h | 1 /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
3 * <linux/gpio.h> - userspace ABI for the GPIO character devices
21 * Must be a multiple of 8 to ensure 32/64-bit alignment of structs.
26 * struct gpiochip_info - Information about a certain GPIO chip
27 * @name: the Linux kernel name of this GPIO chip
28 * @label: a functional name for this GPIO chip, such as a product
30 * @lines: number of GPIO lines on this chip
35 __u32 lines; member
39 * Maximum number of requested lines.
41 * Must be no greater than 64, as bitmaps are restricted here to 64-bits
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| /linux-6.14.4/Documentation/devicetree/bindings/gpio/ |
| D | gpio-mmio.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/gpio/gpio-mmio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Generic MMIO GPIO
10 - Linus Walleij <[email protected]>
11 - Bartosz Golaszewski <[email protected]>
14 Some simple GPIO controllers may consist of a single data register or a pair
15 of set/clear-bit registers. Such controllers are common for glue logic in
16 FPGAs or ASICs. Commonly, these controllers are accessed over memory-mapped
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| D | nuvoton,sgpio.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/gpio/nuvoton,sgpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jim LIU <[email protected]>
21 GPIO pins can be programmed to support the following options
22 - Support interrupt option for each input port and various interrupt
23 sensitivity options (level-high, level-low, edge-high, edge-low)
24 - ngpios is number of nuvoton,input-ngpios GPIO lines and nuvoton,output-ngpios GPIO lines.
25 nuvoton,input-ngpios GPIO lines is only for GPI.
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| D | intel,ixp4xx-gpio.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/gpio/intel,ixp4xx-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Intel IXP4xx XScale Networking Processors GPIO Controller
10 This GPIO controller is found in the Intel IXP4xx
11 processors. It supports 16 GPIO lines.
12 The interrupt portions of the GPIO controller is hierarchical.
13 The synchronous edge detector is part of the GPIO block, but the
15 main IXP4xx interrupt controller which has a 1-to-1 mapping for
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| /linux-6.14.4/Documentation/devicetree/bindings/input/ |
| D | gpio-matrix-keypad.txt | 1 * GPIO driven matrix keypad device tree bindings
3 GPIO driven matrix keypad is used to interface a SoC with a matrix keypad.
4 The matrix keypad supports multiple row and column lines, a key can be
6 keypad can sense a key-press and key-release by means of GPIO lines and
7 report the event using GPIO interrupts to the cpu.
10 - compatible: Should be "gpio-matrix-keypad"
11 - row-gpios: List of gpios used as row lines. The gpio specifier
12 for this property depends on the gpio controller to
13 which these row lines are connected.
14 - col-gpios: List of gpios used as column lines. The gpio specifier
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| /linux-6.14.4/drivers/staging/greybus/ |
| D | gpio.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * GPIO Greybus driver.
14 #include <linux/gpio/driver.h>
22 /* --> make them just a flags field */
38 struct gb_gpio_line *lines; member
47 return d->domain->host_data; in irq_data_to_gpio_chip()
55 ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_LINE_COUNT, in gb_gpio_line_count_operation()
58 ggc->line_max = response.count; in gb_gpio_line_count_operation()
65 struct gbphy_device *gbphy_dev = ggc->gbphy_dev; in gb_gpio_activate_operation()
73 ret = gb_operation_sync(ggc->connection, GB_GPIO_TYPE_ACTIVATE, in gb_gpio_activate_operation()
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| /linux-6.14.4/tools/testing/selftests/gpio/ |
| D | gpio-sim.sh | 2 # SPDX-License-Identifier: GPL-2.0
6 CONFIGFS_DIR="/sys/kernel/config/gpio-sim"
7 MODULE="gpio-sim"
11 echo "GPIO $MODULE test FAIL"
17 echo "GPIO $MODULE test SKIP"
26 if [ "$BANK" = "live" -o "$BANK" = "dev_name" ]; then
30 LINES=`ls $CONFIGFS_DIR/$CHIP/$BANK/ | grep -E ^line`
32 for LINE in $LINES; do
33 if [ -e $CONFIGFS_DIR/$CHIP/$BANK/$LINE/hog ]; then
76 fail "Unable to set the number of lines"
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| /linux-6.14.4/Documentation/admin-guide/gpio/ |
| D | gpio-mockup.rst | 1 .. SPDX-License-Identifier: GPL-2.0-only
3 GPIO Testing Driver
8 This module has been obsoleted by the more flexible gpio-sim.rst.
14 The GPIO Testing Driver (gpio-mockup) provides a way to create simulated GPIO
15 chips for testing purposes. The lines exposed by these chips can be accessed
16 using the standard GPIO character device interface as well as manipulated
20 --------------------------------------------
22 When loading the gpio-mockup driver a number of parameters can be passed to the
28 pairs. Each pair defines the base GPIO number (non-negative integer)
29 and the first number after the last of this chip. If the base GPIO
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| D | gpio-sim.rst | 1 .. SPDX-License-Identifier: GPL-2.0-or-later
3 Configfs GPIO Simulator
6 The configfs GPIO Simulator (gpio-sim) provides a way to create simulated GPIO
7 chips for testing purposes. The lines exposed by these chips can be accessed
8 using the standard GPIO character device interface as well as manipulated
12 ------------------------
14 The gpio-sim module registers a configfs subsystem called ``'gpio-sim'``. For
21 **Group:** ``/config/gpio-sim``
23 This is the top directory of the gpio-sim configfs tree.
25 **Group:** ``/config/gpio-sim/gpio-device``
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| /linux-6.14.4/Documentation/devicetree/bindings/spi/ |
| D | spi-gpio.yaml | 1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/spi/spi-gpio.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: SPI-GPIO
10 - Rob Herring <[email protected]>
13 This represents a group of 3-n GPIO lines used for bit-banged SPI on
14 dedicated GPIO lines.
17 - $ref: /schemas/spi/spi-controller.yaml#
21 const: spi-gpio
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| /linux-6.14.4/drivers/gpio/ |
| D | gpio-mockup.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * GPIO Testing Device Driver
6 * Copyright (C) 2015-2016 Bamvor Jian Zhang <[email protected]>
15 #include <linux/gpio/driver.h>
31 * We're storing two values per chip: the GPIO base and the number
32 * of GPIO lines.
39 * struct gpio_pin_status - structure describing a GPIO status
40 * @dir: Configures direction of gpio as "in" or "out"
41 * @value: Configures status of the gpio as 0(low) or 1(high)
42 * @pull: Configures the current pull of the GPIO as 0 (pull-down) or
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| /linux-6.14.4/Documentation/devicetree/bindings/auxdisplay/ |
| D | hit,hd44780.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Geert Uytterhoeven <geert@linux-m68k.org>
14 LCDs that can display one or more lines of text. It exposes an M6800 bus
15 interface, which can be used in either 4-bit or 8-bit mode. By using a
16 GPIO expander it is possible to use the driver with one of the popular I2C
24 data-gpios:
26 GPIO pins connected to the data signal lines DB0-DB7 (8-bit mode) or
27 DB4-DB7 (4-bit mode) of the LCD Controller's bus interface.
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| /linux-6.14.4/Documentation/devicetree/bindings/serial/ |
| D | nxp,sc16is7xx.yaml | 1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: NXP SC16IS7xx Advanced Universal Asynchronous Receiver-Transmitter (UART)
10 - Hugo Villeneuve <[email protected]>
15 - nxp,sc16is740
16 - nxp,sc16is741
17 - nxp,sc16is750
18 - nxp,sc16is752
19 - nxp,sc16is760
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| /linux-6.14.4/drivers/media/i2c/ |
| D | max9271.h | 1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2017-2020 Jacopo Mondi
4 * Copyright (C) 2017-2020 Kieran Bingham
5 * Copyright (C) 2017-2020 Laurent Pinchart
6 * Copyright (C) 2017-2020 Niklas Söderlund
84 * struct max9271_device - max9271 device
92 * max9271_wake_up() - Wake up the serializer by issuing an i2c transaction
101 * max9271_set_serial_link() - Enable/disable serial link
110 * max9271_configure_i2c() - Configure I2C bus parameters
123 * max9271_set_high_threshold() - Enable or disable reverse channel high
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